reusing head gaskets

Can cometic MLS head gaskets be reused? Gaskets were installed and torqued but not fired.

mine were retorqued 4 times when I built mine / measureing things . I didnt torque them to full torque untill the last tightening , which was only 5 pounds diff.
I`ve read they can be reused by quite a few people . even used to be in their advertisement ----------